(On hold) This is a 1946 Blue Diamond Parker Vacumatic Major fountain pen in Azure Pearl celluloid, with gold-filled trim, and a 14k gold XF Semi-Flex nib. The pen has been restored, which included a complete disassembly, a gentle cleaning, an overhaul of the filling mechanism, ink flow adjustment, a nib tune-up, and a gentle polish with a soft cloth. This is a full-size pen, measuring a little over 5" capped and 0.48" in diameter, very typical of this model.
It's very interesting that a lot of new fountain pen enthusiasts are interested in improving their handwriting, and, in particular, in learning (or re-learning) cursive. There's been a lot of discussion lately about the value of learning cursive, and, often, the fountain pen is thought of as the ideal tool with which to learn cursive. I am not sure if the fountain pen is the answer, but I do believe it offers a combination of features that can be extremely helpful in improving one's handwriting.
The Parker Vacumatic I'm offering today is an excellent penmanship improvement tool. It is a full-size pen (though somewhat smaller than most modern luxury pens), perfectly balanced, with a pleasant tactile sensation, a high-capacity filling mechanism, and an XF semi-flexible nib. The nib is tuned to write at the lightest touch, producing a line of about 0.3 mm (on my paper), opening up to about 0.7 mm, with relative ease. However, this nib is not meant to be flexed a lot, but, rather, it's excels at adding a touch of character, a hint of line variation to your handwriting.
The nib comes with ample tipping material, of perfect geometry and alignment, giving you consistency, virtually regardless of the direction or rapidity of your strokes. Admittedly, the nib produces a more graceful line with rapid strokes, but you can also use it effectively for slow, methodical practice.